When prototyping a new layout its convenient to use placeholder images then it is to use the final images. You could make the placeholder images in an image editing program. There is a far better way using image placeholder tools you can quickly get an image of any size you require by simply going to website and placing your desired width and height after the address.

placehold.it

How does it work? Just put your image size after our URL and you’ll get a placeholder.

Holder.js

Holder renders image placeholders entirely in browser.

placekitten

A quick and simple service for getting pictures of kittens for use as placeholders in your designs or code. Just put your image size (width & height) after our URL and you’ll get a placeholder.